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#1
February 16th 05, 04:37 PM
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Canon 1.4 EF extender
I just got Canon EF 1.4xII extender and looks like AF and IS is not working
with my 100-400 4.5 IS L lens anybody out there with similar experience ? According to dealer BH should work. Thanks for any comments ...emski 
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#2
February 16th 05, 04:48 PM
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"emski" wrote in message news  I just got Canon EF 1.4xII extender and looks like AF and IS is not working with my 100-400 4.5 IS L lens anybody out there with similar experience ? According to dealer BH should work. What camera body? IS should work but AF will not work at max aperture of f/8 (i.e.. on the 10/20/300D).
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#3
February 16th 05, 06:25 PM
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What camera body? upss.. 20D sorry IS should work but AF will not work at max aperture of f/8 (i.e.. on the 10/20/300D).
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#4
February 16th 05, 06:43 PM
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The Image stabilization should work.. yehhh... looks like IS is working, do you know which pin to tap ? or might be some link how to do it ? mark
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#5
February 16th 05, 06:43 PM
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The Image stabilization should work.. yehhh... looks like IS is working, do you know which pin to tap ? or might be some link how to do it ? mark
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#6
February 17th 05, 12:02 AM
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There is a trick that's supposed to work that involves taping one
of the lens contacts so the camera can't read the lens f number Note that this doesn't mean it will reliably autofocus (since the sensors require a certain amount of contrast and light to do so reliably), it simply means it will TRY to AF, with patchy results 
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#7
February 17th 05, 12:02 AM
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There is a trick that's supposed to work that involves taping one
of the lens contacts so the camera can't read the lens f number Note that this doesn't mean it will reliably autofocus (since the sensors require a certain amount of contrast and light to do so reliably), it simply means it will TRY to AF, with patchy results
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#8
February 17th 05, 01:12 AM
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Look at the last post in this message thread on fredmiranda.com. Thanks Jim mark
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#9
March 5th 05, 04:14 PM
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Emski,
p64 from the 20D manual states... "If an extender (optional) is attached and the maximum aperture of the lens is f/5.6 or smaller, AF will not be possible. For details, see the Extender's instructions." Canon's Extender product sheet states... "When Extender EF1.4x II is attached, the lens maximum aperture will be smaller (darker) by 1 stop." With variable f range of your 100-300 f4.5-f5.6 (when increased 1-stop for the 1.4x extender) has a 'combined range' equal to f6.3-f9.0 and therefore autofocus will NOT function. B&H should not be telling you this combination will work. Regards DM "emski" wrote in message news  What camera body? upss.. 20D sorry IS should work but AF will not work at max aperture of f/8 (i.e.. on the 10/20/300D).
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#10
March 5th 05, 04:14 PM
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Emski,
p64 from the 20D manual states... "If an extender (optional) is attached and the maximum aperture of the lens is f/5.6 or smaller, AF will not be possible. For details, see the Extender's instructions." Canon's Extender product sheet states... "When Extender EF1.4x II is attached, the lens maximum aperture will be smaller (darker) by 1 stop." With variable f range of your 100-300 f4.5-f5.6 (when increased 1-stop for the 1.4x extender) has a 'combined range' equal to f6.3-f9.0 and therefore autofocus will NOT function. B&H should not be telling you this combination will work. Regards DM "emski" wrote in message news What camera body? upss.. 20D sorry IS should work but AF will not work at max aperture of f/8 (i.e.. on the 10/20/300D).
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